Throughout corporate and financial history there are many significant losses dotted across different countries. This list is a simple catalog of these major losses with lessons learnt and failed actions by the protagonists.
2021 JP Morgan Chase Trading Loss aka London Whale https://en.wikipedia.org/wiki/2012_JPMorgan_Chase_trading_loss#cite_note-35
2021 Credit Suisse Archegos Report https://www.credit-suisse.com/about-us/en/reports-research/archegos-info-kit.html